LG RT-20LA90 Service Manual page 17

No Raster on Component signal
Repeat
[A] Process
Pass
Check the signal of
L1200, L1202, L1203
Pass
Check the input/
output of IC1
Check the input/output
of IC800, IC851
Pass
Check the input/
output of IC901
Pass
Check input source cable and jack
Check JA1200 or
RCA CABLE
Fail
Re-soldering or
Change the defect part,
Fail
Check X11
Re-soldering or
Change the defect part
Fail
Re-soldering or
Change the defect part,
Fail
Check X900
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